package com.mango.community.entity;

/**
 * @Author:  MangoCookieMilk
 * @Date:     2020/7/19 22:12
 * 封装分页相关的信息
 */
public class Page {
    /**
     * 当前页码
     */
    private int current = 1;
    /**
     * 显示的页数
     */
    private int limit = 10 ;
    /**
     * 数据总数 ，用来计算总页数
     */
    private int rows;
    /**
     * 查询路径（用于复用分页链接）
     */
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current>=1){
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >=1 && limit<=100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows >= 0){
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /** 获取当前页的起始行
     * @return
     */
    public int getOffset(){
        return (current-1)*limit;
    }

    /**获取总页数
     * @return
     */
    public int getTotal(){
        if (rows % limit == 0){
            return rows/limit;
        }else {
            return rows/limit+1;
        }
    }

    /** 获取起始页码
     * @return
     */
    public int getFrom(){
        int from = current-2;
        return from < 1 ? 1 : from;
    }

    /**获取结束页码
     * @return
     */
    public int getTo(){
        int to = current+2;
        return to >getTotal() ? getTotal() : to;
    }
}
